Complying with the ZERO Code entails first meeting the minimum prescriptive or performance requirements for building energy efficiency defined by ASHRAE Standard 90.1-2016. As part of a standardized and predictable process to continue to advance energy efficiency, new standards that exceed ASHRAE Standard 90.1-2016 have been incorporated into the ZERO Code, such as the 2018 International Green Construction Code (IgCC) and ASHRAE Standard 189.1-2017. Newer versions of ASHRAE 90.1, 189.1 and the IGCC will be incorporated as they are published. Once the minimum energy efficiency requirements are met, then the on-site and/or off-site renewable energy is calculated to achieve zero-net-carbon. Once the minimum requirements of the standard are met, then on-site and/or off-site renewable energy is calculated to achieve a zero-net-carbon building design (access the Energy Calculator).